DONATE

IAHR Document Library


« Back to Library Homepage « Proceedings of the 4th IAHR European Congress (Liege, 2016)

Estimation of 1D-Confluence Model Parameters in Right-Angled Discordant Beds' Confluences Using 3D Numerical Model

Author(s): D. Dordevic

Linked Author(s):

Keywords: No keywords

Abstract: Parameters of 1D confluence models are originally defined for concordant beds’ (CB's) confluences. This paper aims at estimating these parameters for discordant beds’confluences using numerical simulation results of 3D flow. A 3D finite-volume based model SSIIM2 that was successfully validated in CB's confluences is applied in this study, too. Confluences with the low, moderate and maximal observed bed elevation discordance ratio values are analysed for three characteristic hydrological scenarios: dominance of the tributary flow, equal contributions of the combining flows and dominance of the main-river flow. It is shown that: 1) the mean flow angleδapproaches junction angleαwith the increase in bed elevation discordance, especially when tributary flow dominates, 2) the value of Hager’s correction coefficientσis not constant and 3) the contribution of the tributary flow to the 1D momentum equation is under predicted when either parameterδorσis used for its estimation.

DOI:

Year: 2016

Copyright © 2024 International Association for Hydro-Environment Engineering and Research. All rights reserved. | Terms and Conditions